Hitachi RAS-18FSXNS2E - Examples

24
PMML0628 rev.0 - 05/2023
3
PIPE SIZE SELECTION
PIPING WORK AND REFRIGERANT CHARGE
Ⓖ CH-Box
Type CH-Box Model Branch
Number of connectable
indoor unit per branch
*4
Available combinaon of indoor unit
capacity (HP)
per CH-Box
per Branch
Single
*3
CH-AP160SSX 1 1 - 7
*1
6.0 ≤6.0
CH-AP280SSX 1 1 - 8
*1
10.0 ≤10.0
Mulple
CH-AP04MSSX 4 1 - 6
*2
16.0 ≤6.0 / 1x8.0HP / 1x10.0HP
CH-AP08MSSX 8 1 - 6
*2
30.0 ≤6.0 / 1x8.0HP / 1x10.0HP
CH-AP12MSSX 12 1 - 6
*2
30.0 ≤6.0 / 1x8.0HP / 1x10.0HP
CH-AP16MSSX 16 1 - 6
*2
30.0 ≤6.0 / 1x8.0HP / 1x10.0HP
*1
: When mulple indoor units are connected to the same CH-Box, they are controlled with the same operaon mode.
*2
: The indoor units connected to the same branch of the CH-Box are controlled with the same operaon mode.
*3
: The liquid pipe is not required to connect to the CH-Box.
*4
: In case that the number of connectable indoor unit exceeds four, the high/low pressure gas pipe, gas pipe and liquid
pipe need to increase one size respecvely.
3.2.2 Examples
Term
Symbol
Descripon
Total Piping Length
Example 1
a+b+c
Total length of all liquid pipes (sum)
Example 2
d+e+f+g+h
Maximum Piping Length
Example 1
a+c
Actual length of the liquid pipe from outdoor unit stop
valve or piping connecng kit to the terminal unit.
Example 2 f+h
Piping Length -
Actual length of liquid pipe out of consideraon of local
resistance, such as bent or elbow.
Equivalent Length -
This length is obtained by converng local resistance, such
as bent or elbow, to straight pipe length.
◆ Example 1: Line branch (including main pipe branch)
Indoor
Unit
Indoor
Unit
Outdoor
Unit
A
First Branch
Mul-Kit
a
b
c